Temperature responsive resistance element



April 1945- R. P. MATTERN 2,372,840

TEMPERATURE RESPONSIVE RESISTANCE ELEMENT Filed Novk 6, 1942 I an (Ittorneg Patented Apr. 3 1 945 is, Mime, ass fioneyvveli Regulator reapolis, Minn, a corporation of This invention relates to temperature responsive resistance elements and more particularly to an immersion type temperature responsive resistance bulb for use in the'electrical measuremerits of temperature such as for airplane engines and oil temperature control systems.

object of my invention is to provide a comact immersion type temperature responsive reistance bulb of great efiici ncy compared its size of'such simplicity in construction as to ada; t it for rapid manufacture at low cost.

Anot -er object my vention is to provide in a temperature responsive resistance bulb a spool upon which a suitable resistance element may be wound, such spool formed of suitable insulating material which may be rapidly and efficiently molded a single operation.

Another object of my invention is to provide in a temperature responsive resistance bulb, an insulating spool formed in a single part-of suitable plastic material and having three flanges, between two of which is wound the resistance elements and the third flange havingsuitable contact members mounted thereon. The first two flange mem bers further serve to slidably engage the inner side wall of an immersion type bulb so as to accurately position the resistance winding immediately adjacent to the side wall of said bulb so that it may more readily respond to the temperature thereof.

Another object of my inventionis to provide a moldalole insulation spool of the character described readily adaptedfor carrying a plurality of layers of the resistance winding and including a slot extending longitudinally therein for receiving and fastening a conductor leading from one end of the winding and a slot formed in one i the flanges for receiving a conductor leading from the opposite end of said winding so as to thereby provide simple and efficient means for mounting the winding upon the spool so that the same may be rapidly and efficiently assembled without loss of time and at minimum expense and labor.

Gt tion are set forth in the following description, taken with the accompanying drawing, and the novel features thereof are pointed out in the appended claims. The disclosure, however, is illustrative only and I may make changes in details, especially in matters of shape, size, and ar .rangernent of parts within the principles of my invention to the full extent indicated by the meanings of the terms in which the appended claims are expressed.

-er objects and advantages of this invenin. the accompanying drawing wherein like reference characters) ldicate Corresponding parts of the various Fi ure -s a se nal view of my in type temperatu' Figure 2 is detai the insulation spool, shown in F 3 Figure is a sectional view of my in Figure taken along the lines 2 ingin the direction of the arrows,

Figure 4: is a sectional view 0:" Figure 2 taken along the lines and looking in the direction of the arrows, and

Figure 5 is end view of shown in Figure 2.

In theiorm of my invention illustrat ure 1 there is 1 ovided e, sleeve threaded section 23 and a projecti' preferably formed in a hexagonal outlin or rcceiving a wrench or other means for secui ng the threaded portion in a tapped hole in en ine cylinder wall or the like. The threaded end of the sleeve 5 has provided therein an aperture 3 within which there is disclosed a tubular shell closed at one end and having the opposite open end resting upon a shoulder portion formed within aperture 4- of the sleeve An annular opening formed in the sleeve i surrounds the shell A suitable quantity of solder is disposed within the annular opening '5 so as to seal the shell to the sleeve i, and close the opening as hown in Figure l.

The tubular shell 5 is preferably formed of copthe insulation spool 1 per or other suitable heat conducting material so that a heat responsive member mounted within the tubular shell will readily respond to the temperature changes to which the shell may be subjected. Mounted therefore within the shell is a temperature responsive resistance winding preferably comprising three layers of No. to Balco single glass covered wire which possesses a relatively high temperature coefficient or" resistance, or other suitable temperature responsive, resistance material.

In order to support the resistance winding within the tubular shell 5 I have provided a spool preferably formed of moldable Bakelite. Formed integral with the spool it are the radial flanges El, l2 and positioned in spaced relation along the spool it. The annular flanges l i and i2 are of a substantially equal circumference. Wound about the spool portion 10 separating the said flanges ii and i2 is the resistance element 9. Extending longitudinally along one side of the spool l0 is a slot l4 indicated by dotted lines in Figures 1 and ,2. A second slot i5 is positioned in the flange l2 as seen in Figures 1, 2 and l.

Theresistance wire 9 extending from one end l6 of contact pin 2G is disposed within the slots I5 and Hi to the annular flange H where the resistance winding is started about the core loin a spiral manner toward flange 15, additional layers may be added by continuing to wind the wire spirally on the core between flanges H and 12. Three layers of resistance winding are preferably made and the winding terminating at the end of the/third layer adjacent the flange I2. A slot H is formed in this flange l2, as shown in Figures 2 and 4, and the end of the resistance winding 3 extends through the slot ll, terminating at l8, which is the inner end of the contact pin 25, as shown in Figure l.

The flange is has a greater circumference than the flanges H and i2 and has projecting therethrough contact pins 24 and having the ends it and I8 to which the ends of the resistance winging 9 are attached respectively. The said flange I3 is formed at the opposite end of the core ill from the flange H. Upon the core in being inserted within the tubular shell 5, annular flange i3 is adapted to rest upon a seat portion 2! formed within the sleeve I, and the annular flanges ii and I2 are adapted to slidably engage the inner surface 22 of the tubular shell 5 and thereby accurately position the temperature revided in the insulation member 23, wherein the' parts 25 and 25 are held by the member l3 and the shoulder portion of said recesses. The members l3 and 23 have formed at the circumferential edge thereofthe projecting parts 26 and 2! respectively adapted to slidably fit within a'longitudinal groove 33 formed in the inner surface of the sleeve i so as to lock the members l3 and 23 and thus the core ill from rotary movement'within the shell 5 and sleeve I. The member 23 further has provided an annular indented portion 28 for receiving a split ring 29 adapted to engage in an annular channel 30 formed within the sleeve 9 so as to prevent longitudinal movement of the members l3 and 23 and accordingly the core M. A socket portion 3! surrounds the contacts is and 28 and is adapted to receive a suitable plug, not shown, for electrically connecting the temperature responsive resistance element in a manner well known in the art. The outer edge 32 of the socket 3! is threaded for receiving a nut for fastening the plug within said socket. In, operation, from the foregoing description it will be evident that this device may be suitable attached to a portion of an internal'combustion I engine, an oil temperature control system, or to other devices where an immersion type temperature responsive resistance bulb-may be utilized for continuously indicating temperature. When adjusted for use in a suitable device, the temperature of the medium surrounding the shell 5, will be quickly transmitted to the temperature resistance wire 9 whereby a change in the ambient temperature surrounding said shell will cost and with minimum labor.

, asvasao quickly affect the resistivity of the coil a causing it to increase with-a rise in temperature and vice versa, thus causing a change in the value of an instrument or circuit, not shown, which may be in electrical connection with the contact ends [9 and 2fl From the foregoing, it will be readily seen that the core l0 formed of any suitable plastic insulating material, such as Bakelite, may be readily molded in a single operation and in one part together' with the flanges ll, 52 and i3. Thus, the device may be rapidly manufactured at low Because of the simplicity of the construction a minimum number of wearing parts are involved providing a device of sturdy coristruction.

While I have described a preferred embodiment of the invention, it will be understood that various changes may be made in the design and relationship of the several parts without departing from the spirit of my invention as set forth in the following claims.

I claim as my invention:

1. In a temperature responsive resistance bulb for the electrical measurement of temperature,

comprising, in combination, a sleeve, a tubular shell aflixed to said sleeve at one end and closed at the opposite end, a spool formed of insulating material positioned within said shell and sleeve. a first annular flange, a second annular flange and a third annular flange of substantially larger diameter than said first and second flanges, said annular flanges in equal spaced relation and projecting from said spool, a temperature responsive resistance winding having a relatively high coefficient of resistance positioned between said first and second flanges and wound about said spool between said first and second flanges, and said first and second flanges slidably engagin said tubular shall so as to accurately position said resistance winding in heat transfer relation to said tubular shell, whereby said winding assumes the temperature of the medium surrounding said shell, and means engaging said third annular flange for locking said spool within said shell and sleeve.

2. In a temperature responsive resistance bulb for the electrical measurement of temperature, comprising, in combination, a sleeve, a tubular shell aiiixed to said sleeve'at one end and closed at the opposite end, a spool formed of insulating material positioned within said shell and sleeve, 2. first annular flange, a second annular flange and a third annular flange, said annular flanges in spaced relation and projecting from said spool, a temperature responsive resistance winding positioned between said first and second flanges and wound about said spool between said first and second flanges, and said first and second flanges slidably engaging said tubular shell so as to accurately position said resistance winding in relation to said tubular shell, whereby said winding assumes the temperature of the medium sur-. rounding the exteriorof said shell, a shoulder positioned within said sleeve for engaging said third annular flange for locking said spool against longitudinal movement in one direction in relation to said sleeve, an annular member mounted within said sleeve engaging said third annular flange, interfitting portions for preventing rotative movement of said spool within said sleeve and shell, an annular groove formed within said sleeve and a split ring disposed therein for releasably locking said member within said sleeve and preventing longitudinal movement of said spool in a second direction in relation to said sleeve. a

3. In a "temperature responsive resistance element for the electrical measurement of tempera.- ture including a bulb, and a temperature responsive resistance winding mounted within said bulb; the improvement comprising a spool for carrying said temperature responsive winding, said spool Iormedof a plastic like material, a first and a second flange of substantially the same diameter positioned on said spool in spaced relation for supporting said winding, said first and second flanges slidably engaging the interior of said bulb for accurately positioning said winding in relation tosaid bulb, and a third flange which is substantially larger-than said first and second flanges positioned exterior of said bulb for supporting said spool. 1

4. In a temperature responsive resistance element for the electrical measurement of temperature, including a bulb, and a temperature responsive resistance winding mounted within said bulb; the improvement comprising a spoolfor carrying said temperature responsive resistance winding, the said spool formed in one part of Bakelite like material, a first and a second flange formed integral on said spool in spaced relation for supporting said winding, a longitudinal slot iormed in said spool and said second flange for can'yins one terminal of said winding, and a second slot formedin said second flange for carrying flange, means positioned within said sleeve for engaging said third flange for limiting the longitudinal movement thereof in one direction, con- 6. In a temperature responsive resistance element for the electrical measurement of temperature including a bulb and a temperature r s sive resistance winding mounted within said bulb; the improvement comprising a spool formed of a plastic insulating material for carrying said temperature responsive resistance winding, a flrstflange forming a part of said spool and positionedat one end of said spool, a second flange substantially larger than said first flange forming a part or said spool and positioned at the opposite end of said spool, and a third flange forming a part of said spool and positioned intermediate the opposite ends of said spool, said first and third flanges being of substantially the same diameter are provided for the purpose of supporting said resistance winding on said spool, and said second flange including fas- .tening means is provided for securing said spool within said bulb.

} 7. In a temperatureresponsive resistance element for the electrical measurement of temperature, comprising. a structure for supporting said element adjacent a medium whose temperature is to be measured, an annular recess in said structure, a tubular shell aifixed to said structure for insertion in said medium, said tube be ng closed at one end, a core member having a first flanged portion at one end and a second flanged portion at the opposite end, said second flanged portion beingsubstantially larger in diameter than said first flanged portion, an insulated resistance wire having a relatively high temperature coefiicient of resistance wound on said core in abutting relation to said first flange and extending in heat transfer relation to said tubular shell Ior' a substantial distance in the direction of said second flange, said first flange being adapted to support said wire on said core member, and

40 said second flange being engaged in said annular tacts carried by said third flange electrically con- 1 nected to the terminals or said resistance winding, a member positioned adjacent said third flange and engaging said contacts, first means limiting rotative movement of said member and second means limiting longitudinal movement of, said member whereby said spool is fastened by said member within said bulb. I

5. In a temperature responsive resistance element for the electrical measurementof temperature including a bulb and a temperature responsive resistance winding mounted within said bulb; the improvement comprising a .spool for carrylng said temperature responsive winding, said spool formed in one part or Bakelite like material. a first and a second flange formed integral with said spool in spaced relation for supporting said winding. and saidfirst and second flanges slidably engaging the interior of and bulb lolpositioning said winding in relation to said bulb, and

a third flange substantially larger than said first and second flanges tormed integral with saith spool for fastening said spool within said bulb against longitudinal and rot'ative movement relative to said bulb.

recess of said support ng structure to secure said core against longitudinal movement.

8. "In a temperature responsive resistance bulb for the electrical measurement of temperature, comprising, a member for supporting said bulb in a medium whose temperature is to be measured, an annular recess in said supporting memher, a tubular shell aflixed to said member for insertion in said medium, said tube being closed at one end, a core structure provided with first, second, and third flanged portions, said third flanged portion being of substantially greater diameter than said first and second flanged portions, said core member fitting within said shell and said supporting structure in such a manner that said first'and second flanges engage the inner periphery of said shell and said third flange is engaged in the annular recess of said supporting structure, a resistance wire of relatively high temperature coeihcient of resistance spirally wound on said core structure abutting saidflrst flange at one and and said second flange at the other end, and said wire being relation to said shell. 7 1

namonn P.

in heat transfer 

